from bs4 import BeautifulSoup

html_doc = """
<html><head><title>The Dormouse's story</title></head>
<body>
<p class="title"><b>The Dormouse's story</b></p>

<p class="story">Once upon a time there were three little sisters; and their names were
<a href="http://example.com/elsie" class="sister" id="link1">Elsie</a>,
<a href="http://example.com/lacie" class="sister" id="link2">Lacie</a> and
<a href="http://example.com/tillie" class="sister" id="link3">Tillie</a>;
and they lived at the bottom of a well.</p>

<p class="story">...</p>
"""

soup = BeautifulSoup(html_doc, 'html.parser')


# 输出 html
# print(soup.prettify()) 

# 列表方式呈现所有的同类标签
# print(soup.find_all('a')) 

# 找到所有链接
# for link in soup.find_all('a'):
#     print(link.get('href'))
#     print(link.get('class'))

# 找到标签的类名
# print(soup.p['class'])
# print(soup.p.get('class'))

# 从文档中获取所有文字内容
# print(soup.get_text())

# 找到tag的所有属性, 以字典方式呈现
# print(soup.a.attrs)
